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Color Range effect can be a good tool to quickly select an object in the image. It frees you from the tedious procedure of using selection tools, such as the Lasso ( ) or Magic Wand ( ). Below are a few examples of the effect for quick selection of objects.

Moving the Color Threshold control in one direction or another, get a clear silhouette of the car. Make more fine-tuning with Brightness Tolerance control. Click OK.

Select the Magic Wand ( ) in the Tools panel. Tap the Ctrl key and click the Magic Wand inside each of the painted parts of the car.

Uncheck the top layer, and select the bottom layer. The selection is automatically be transferred to the lower layer, which is now active (highlighted in blue).

Recolor the car by means of the Hue / Saturation effect (Adjustments -> Hue / Saturation), using a Hue control. If necessary, use the controls Saturation and Lightness. You can try to use other effects, such as: Saturation RGB, or Curves (Adjustments -> Curves), or Color Balance by BoltBait and other color effects.

This art trick has received the name from the movie with the same name. The purpose of the effect is keeping some colored object on a black and white background.
For this example I took the Image, which used by xmario in the Эффект Контуры (Contours Effect) topic on paint-net.ru site.

We will keep a color image of a rose, moving the rest of the image in black and white. By analogy with the previous example we would have to create two copies of the original image, one for red rose petals, the second for the green trunk. But we will do one copy layer, creating a transparent mask roses instead of two color masks.

Open the image, duplicate a layer, deselect the lower layer.

Run the Color Range effect. Select Yellow or White from the drop down list Color. Set the Color Threshold control to the maximum value - 255. Move the Brightness Tolerance control to the left until the artifacts disappear inside the rose's silhouette.

Click the Magic wand inside rose. You will see that to the contour of rose was added the contour of bear. Enlarge the image in the area marked by a red circle by means of the Zoom ( ) tool.

Using a Pencil ( ) tool divide contours roses and teddy bear applying of any color line to the place where the contours is contacted (blue arrow).

Click the Magic wand inside rose again. Invert selection (Ctrl+I). Uncheck the top layer, and select the bottom layer. The selection is automatically be transferred to the lower layer, which is now active (highlighted in blue).

Apply to the layer Black and White effect (Adjustments -> Black and White) or use the key Ctrl+Shift+G. As a result we've got this image:

This image from my lesson 'Как из черно-белой фотографии сделать цветную' (How to Make a Color Photo from the Black-and-white) on the paint-net.ru site. In this example, we will look at how to simplify the tedious process of selecting objects.
It's easy to see that our image consists of three objects: sky, forest and field with bales of straw. Just select one object - the forest to color all three objects.
So, let's begin.

Open the image, duplicate a layer, deselect the lower layer.

Run the Color Range effect. Select Black from the drop down list Color. The position of the Color Threshold control in this case does not matter, the main thing - it should not be zero. Moving the Brightness Tolerance control to the left, achieve a lack of contact between the lower contour line of pixels of the sky and the upper contour line of the forest. Pay attention to the area marked with red circles.

As in the previous example, use the Pencil ( ) tool to separate bale's end face (black circle) and the lower contour line of the forest.

Click the Magic wand inside the forest.

Uncheck the top layer, and select the bottom layer. Apply Curves (Adjustments -> Curves) or Color Balance effect to color the forest by green color.

or

Uncheck the bottom layer, and select the top layer. Invert selection (Ctrl+I). Select Rectangle ( ) in Tools panel. Tap the Alt key and select by this tool a rectangular area, moving from the lower right corner of the layer in the direction of the arrow until the selection does not override the lower part of the forest's silhouette. Release the Alt key - the selection will contain area of the sky only.

Switch to a lower layer, and colorize the sky by blue color.

Switch between layers again and click the Magic wand inside the forest once more. Invert selection (Ctrl+I). As in the previous step, tap the Alt key and using the Rectangle tool, moving from the top right corner of the layer in the direction of the arrow until the selection does not override the top part of the forest's silhouette. Release the Alt key - the selection will contain area of the field only.

Switch to a lower layer, and colorize the field with bales of straw by yellow color.

The result is a colorized image:

Realistically, isn't it? And, I believe, is not difficult.

Here, in brief, the basic techniques of working with the Color Range effect.
If you can not find a suitable color from the drop-down list, select the Сustom color and define the color using the color wheel.

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One more question Null54...there are 2 different versions...not sure which one to select or does it not matter? One is Color Range_en.zip and the other one is Color Range_ru.zip. Don't want to pick the wrong one.

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ReMake, these were such well made tutorials. To take the time to explain such seemingly little steps that are SO IMPORTANT and SO HELPFUL. You're a wonderful teacher. These can save someone a lot of frustration and a lot of time.